INT 21 U - DOS 3.1+ internal - COMMIT ALL FILES FOR SPECIFIED COMPUTER/PROCESS
        AX = 5D01h
        DS:DX -> DOS parameter list (see AX=5D00h), only computer ID and
                process ID fields used
Return: CF set on error
            AX = error code (see AH=59h)
        CF clear if successful
Notes:  flushes buffers and updates directory entries for each file which has
          been written to; if remote file, calls INT 2F/AX=1107h
        the computer ID and process ID are stored but ignored under DOS 3.3
SeeAlso: AH=68h,INT 2F/AX=1107h